JBoss username and password?

I'm new to JBoss, and I got this problem,
after startup JBoss, I type following url in web browser: http://localhost:8080/jmx-console/index.jsp'.
but authentication popup come up, requesting username and password, could anyone let me know what's the username and password?

There will be no name and password unless you set one. Check the jboss-web.xml file for the jmx-console and see what security domain yet set and work from there.